China Customized Coal Shearer Shafts Manufacturers Suppliers Factory - Made in China

Why Choose Us

Company Honor

We are a certified industrial enterprise research and development institution, innovative enterprise, technology-based enterprise, and high-tech enterprise.

Global Market Coverage

Our products are widely used in underground coal mining areas in Central Asia, South Asia, and various industrial markets around the world.

High-Precision Manufacturing Equipment

Our company is equipped with a variety of high-precision machining equipment, including CNC lathes, rotary lathes, horizontal milling and boring machines, vertical machining centers, and coordinate measuring machines (CMM).

Professional After-Sales Service

We offer comprehensive after-sales support, including return and exchange processing, maintenance and repair, technical support, complaint handling, and standard warranty services. This ensures that our customers enjoy worry-free operation, high-quality products, and reliable support throughout the product lifecycle.

Features of Coal Shearer Shafts

High Load Capacity

Line contact between rollers and raceways allows the bearing to support heavy radial loads.

High Speed Operation

Optimized internal design ensures stable performance and low friction at high speeds.

Easy Installation

A separable inner and outer ring structure simplifies mounting and maintenance.

Axial Displacement Capability

Different structures allow axial movement or shaft positioning when required.

Wide Industrial Applications

Widely used in motors, gearboxes, pumps, compressors, conveyors, and other machinery.

Parameters

Number	Project			Unit	Numerical Value
1	Mining height			mm	(540~800)±10
2	Coal seam dip angle			°	<25


3	Truncation depth			mm	800
4	Roller Diameter			mm	540,600,710,800
5	Drum speed			r/min	104.6±5
6	Traction mechanism	Traction speed		m/min	0~3
7		Rated traction force		kN	120
8		Circular link chain		/	18×64-C
9		Chain breaking force		kN	410
10	Waterway system	Cooler		/	18H-12-RS
		Hydraulic Pressure		MPa	2~5
		Flow		L/min	≥15
11	Electric department	Model		/	YBC-100A(JDMB-100SA)
		Rated power		kW	100
		Rated voltage		V	660
		Rated speed		r/min	1470
		Cooling	Mode	/	Shell water-cooled
			Hydraulic Pressure	MPa	1±0.5
			Flow	L/min	16.7
12	*External dimensions (L W * H)**			mm	4880910380(425)
13	Overall weight			kg	7000

Material of Coal Shearer Shafts

High Tensile Strength
The shaft must resist permanent deformation under high torque loads.

Impact Toughness
Mining conditions often create sudden shock loads when the cutting drum hits hard rock inclusions. Good toughness prevents brittle fracture.

Fatigue Resistance
Since the shaft rotates continuously under cyclic stress, excellent fatigue life is necessary.

Wear Resistance
Spline sections, bearing seats, and coupling surfaces experience friction and require hardened surfaces.

Corrosion Resistance
Although alloy steel is not stainless, protective coatings or proper lubrication help resist corrosion caused by underground humidity.

Mechanical Requirements of Coal Shearer Shafts

Torsional Capacity

The shaft must safely transmit rated torque and withstand overload conditions. Engineers calculate shaft diameter based on torsional shear stress formulas and service factors.

Dimensional Accuracy

Bearing seats, spline teeth, keyways, and coupling interfaces require precise tolerances to ensure correct assembly and alignment.

Straightness and Balance

Poor shaft straightness may cause vibration, premature bearing wear, and seal damage. Dynamic balancing is often recommended for high-speed rotating shafts.

Surface Finish

Critical surfaces must be finely machined to reduce stress concentration and wear. Grinding is commonly used for bearing journals.

Usage of Coal Shearer Shafts

Heavy Duty Continuous Operation

Many shearers run for long shifts with minimal stoppage. This requires high reliability and thermal stability.

Shock and Overload

Coal seams often contain rock bands or harder zones that suddenly increase cutting resistance. The torque shaft must absorb temporary overloads without failure.

Dust and Moisture

Underground mines contain abrasive coal dust and moisture, which can damage exposed surfaces and seals.

Maintenance Demands

Because downtime in mining is expensive, shafts should be designed for easy replacement and long service intervals.

FAQ

Q: Which underground mining method uses a shearer to extract coal?

A: Longwall Mining
Longwall Mining: A mechanized coal shearer is mounted between a conveyer system and a series of self-advancing hydraulic roof supports. This machine moves along the panel of coal to lengths of 820 feet and is almost completely automated.

Q: What is a coal shearer shaft?

A: It is a key component that transmits power from the motor or hydraulic system to the cutting drums for efficient coal extraction.

Q: What materials are used?

A: High-strength alloy steels such as 40Cr or 42CrMo are commonly used, usually heat-treated for durability, wear resistance, and fatigue strength.

Q: What common issues occur?

A: Twisting or breakage from overload, bearing wear causing unstable transmission, gear misalignment leading to vibration or noise, and surface wear are typical problems.

Q: How can lifespan be extended?

A: Avoid overloading, maintain proper alignment, regularly inspect bearings and gears, and ensure proper lubrication.

Coal Shearer Shafts

Your Professional Coal Shearer Shafts Supplier

Why Choose Us

Features of Coal Shearer Shafts

Parameters

Mechanical Requirements of Coal Shearer Shafts

Usage of Coal Shearer Shafts

FAQ